linux-kernel - Re: [PATCH 3/3] Add timeout feature

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Message-ID: <20080708234120.5072111f@infradead.org>
Date:	Tue, 8 Jul 2008 23:41:20 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hch@...radead.org, miklos@...redi.hu, tytso@....edu, pavel@...e.cz,
	t-sato@...jp.nec.com, akpm@...ux-foundation.org,
	viro@...IV.linux.org.uk, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, dm-devel@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, mtk.manpages@...glemail.com
Subject: Re: [PATCH 3/3] Add timeout feature

On Wed, 09 Jul 2008 08:22:56 +0200
Miklos Szeredi <miklos@...redi.hu> wrote:

> On Wed, 9 Jul 2008, Christoph Hellwig wrote:
> > On Wed, Jul 09, 2008 at 08:13:21AM +0200, Miklos Szeredi wrote:
> > > This would mean that freeze and thaw will have to be done on the
> > > same file descriptor, but this isn't unreasonable to expect, is
> > > it?
> > 
> > It is certainly not the current use case, where you run one command
> > to freeze the filesystem and another one to unfreeze it.
> 
> So instead of
> 
>   freeze_fs mountpoint
>   backup-command
>   unfreeze_fs mountpoint
> 
> the user would have do to
> 
>   run_freezed mountpoint backup-command
> 
> I find the second one nicer, regardless of any reliability issues.

nah he needs to do

make_snapshot ; backup-command ; unref_snapshot.

freezing isn't the right solution for the backup problem ;)


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